Pick newer buildout.

As h.r.download was anyway updated, it will result in a lot of recompilation,
so it is the best moment to upgrade buildout.

stack/erp5.cfg

@@ -442,7 +442,7 @@ scripts =
 
 [versions]
 # Use SlapOS patched zc.buildout
-zc.buildout = 1.6.0-dev-SlapOS-004
+zc.buildout = 1.6.0-dev-SlapOS-005
 
 # pin Acquisition and Products.DCWorkflow to Nexedi flavour of eggs
 Acquisition = 2.13.7nxd001